JASIŃSKI, Grzegorz. A Letter from Masurian Host Adam Gunia to Olsztyn Superintendent Johannes Hassenstein as an Example of Masurian Epistolography During World War I. Echa Przeszłości, [S. l.], n. X, 2019. DOI: 10.31648/ep.3483. Disponível em: https://czasopisma.uwm.edu.pl/index.php/ep/article/view/3483. Acesso em: 15 nov. 2026.